linux-kernel - Re: [RFC PATCH 5 1/7] kmod - add workqueue service thread store

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Date:	Thu, 02 Apr 2015 13:43:31 +0100
From:	David Howells <dhowells@...hat.com>
To:	Ian Kent <raven@...maw.net>
Cc:	dhowells@...hat.com,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <onestero@...hat.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Benjamin Coddington <bcodding@...hat.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Jeff Layton <jeff.layton@...marydata.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [RFC PATCH 5 1/7] kmod - add workqueue service thread store

Ian Kent <raven@...maw.net> wrote:

> +static struct umh_wq_entry *umh_wq_find_entry(int token)
> +{
> +	struct umh_wq_entry *this, *entry;
> +	struct hlist_head *bucket;
> +	unsigned int hash;
> +
> +	hash = hash_32((unsigned long) token, UMH_WQ_HASH_SHIFT);
> +	bucket = &umh_wq_hash[hash];
> +
> +	entry = ERR_PTR(-ENOENT);
> +	if (hlist_empty(bucket))
> +		goto out;
> +
> +	hlist_for_each_entry(this, bucket, umh_wq_hlist) {
> +		if (this->token == token) {
> +			entry = this;
> +			break;
> +		}
> +	}
> +out:
> +	return entry;
> +}

Can "struct umh_wq_entry *" be used as the token?

David
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